The mass of ordinary matter can be considered to a very good approximation the sum of the mass of the protons and neutrons, using an approximation that electron mass is negligible and that the neutron mass is equal to the proton mass. So, since we can now calculate the mass of the proton to a VERY precise level (the 2010 & 2013 muonic hydrogen measurements to refine the CODATA proton data are converging on Haramein’s value), there is a very clear equation that identifies the source of mass of matter.